Happy Valley 1ha

General Information

Created: 2013-12-27 15:50:45
Modified: 2014-02-03 14:04:02

Active: Yes
Country:United States
Site:Happy Valley
CALM-Code:U9 A
Responsible Countries: United States,
Timezone:UTC/GMT -09:00 hours
Vegetation Type:Shrub Tundra
Responsible Person:Vladimir E. Romanovsky
Offset:10 m


Happy Valley grid is located on the Unglaciated foothills.  Landcover units include Tussock-graminoid, dwarf- shrub tundra and low-shrub tundra (moist acidic). U9a 1-ha grid located within U9B 1-km grid.



1 ha grid consists of a square array of surveyed permanent stakes separated by 10 m, yielding an 11 × 11 array of sampling nodes on each grid. Thaw depth and snow sampling was conducted twice by manual probing at each stake. The two values for each sampling point are averaged, yielding a maximum of 121 data points per grid per probing date. The active layer was not measured at locations where grid points intersect rocks or deep water.


Only thaw depth data determined by mechanical probing is reported on CALM website. For additional data refer to http://www.gi.alaska.edu/snowice/Permafrost-lab/index.html or contact site investigators directly

Slope:3 °
Permafrost Zone:Continuous
Vegetation:Tussock-graminoid, dwarf- shrub tundra and low-shrub tundra (moist acidic)
Landform:Unglaciated foothills
Lithology: Ruptic-Histic Aquiturbel
Description:General description of soil moisture : moist
Access Timeseries
Bibliographic References
Walker, D. A., H. E. Epstein, W. A. Gould, A. Kade, A.M. Kelley, J. A. Knudson, W. B. Krantz, R. A. Peterson, G. Michaelson, R.A. Peterson, C. L. Ping, M. A. Raynolds, V. E. Romanovsky, Y. Shur, and M.D. Walker, Frost-boil ecosystems: complex interactions between landforms, soils, vegetation, and climate, Permafrost and Periglacial Processes, 15: 171-188, 2004.
Sturm, M., Schimel, J., Michelson, G., Welker, J., Oberbauer, S. F., Liston, G. E., Fahnestock, J., and V. E. Romanovsky, Are winter biological processes important in converting arctic tundra to shrubland?, BioScience, Vol. 55, No. 1: 17 26, 2005.
Shimel, J. P., Fahnstock, J., Michaelson, G. J., Mican, C., Ping, C., Romanovsky, V. E. and J. Welker, A microbial activity based model of winter CO2 fluxes in Arctic tundra communities, Arctic, Antarctic, and Alpine Research,Vol. 38, No. 2, 249-256, 2006.
Nicolsky, D. J., Romanovsky, V. E., Alexeev, V. A. and D. M. Lawrence, Improved modeling of permafrost dynamics in Alaska with CLM3, Geophysical Research Letters, VOL. 34, L08501, doi:10.1029/2007GL029525, 2007.
Nicolsky, D. J., Romanovsky, V.E., and G. S.Tipenko, Using in-situ temperature measurements to estimate saturated soil thermal properties by solving a sequence of optimization problems, The Cryosphere, 1, 41 58, 2007.
Brown, J. and V. E. Romanovsky, Report from the International Permafrost Association: State of Permafrost in the First Decade of the 21st Century, Permafrost and Periglacial Processes, 19: 255 260, 2008.
Nicolsky, D. J., Romanovsky, V.E., Tipenko, G. S., and D. A. Walker, Modeling biogeophysical interactions in non-sorted circles in the Low Arctic, Journal of Geophysical Research, in press
Walker, D.A., H.E. Epstein, V.E. Romanovsky, C.L. Ping, G.J. Michaelson, R.P. Daanen, Y. Shur, R.A. Peterson, W.B. Krantz, M.K. Raynolds, W.A. Gould,
Romanovsky, V. E., Marchenko, S. S., Daanen, R., Nicolsky, D. J., Sergeev, D. O., and D. A. Walker, Soil climate and frost heave along the Permafrost/Ecological North American Arctic Transect, In Proceedings of the Ninth International Conference on Permafrost, June 29-July 3, Fairbanks, Alaska, 2008, in press
Nicolsky, D. J., Tipenko, G. S., Romanovsky, V. E. and D. A. Walker, Modeling Observed Differential Frost Heave within Non-Sorted Circles in Alaska, In Proceedings of the Ninth International Conference on Permafrost, June 29-July 3, Fairbanks, Alaska, 2008, in press
Kade, A., Romanovsky, V. E. and D. A. Walker, The N-factor of nonsorted circles along a climate gradient in Arctic Alaska, Permafrost and Periglacial Processes, 17: 279-289, 2006.
G. Gonzalez, D.J. Nicolsky, C.M. Vonlanthen, A.N. Kade, P. Kuss, A.M. Kelley, C.A. Munger, C.T. Tarnocai, N.V. Matveyeva, and F.J.A. DaniĐšls, Arctic patterned-ground ecosystems: a synthesis of studies along a north American arctic transect, Journal of Geophysical Research, in press

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U9a Happy valleyU9a Happy valley2

Longitude:-148.833333 °
Latitude:69.166667 °
Elevation:322.314209 m
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